If you haven't already...

Read the Harry Potter series. I, Kelly, have started it and it makes much more sense out of the movies. I saw that the 6th movie was coming out and I thought that I would start and you realize how much detail and info they leave out in the movies. I've heard that they are making the 7th movie into two movies because it's so long. But anyways if you haven't already read the Harry Potter series then I recommend you read them. 

* btw, the actors for Ron and Hermione look totally different than in the books if you haven't already read them then when you do that's something to know.